Recrystalization is the metamorphic process that occurs under situations of intense temperature & pressure where grains molecules or atoms of a rock or mineral are packed closer together creating a new crystal structure.

Define lithostaic pressure

Lithostatic pressure is the pressure exerted on rocks by the weight of overylying rocks

Define differential pressure

Differential pressure is the pressure that is not applied equally to all sides of a rock body

Define foliation

Foliation is the processes of being split into thin sheets is the result of differential pressure

Name the types of metamorphism

Regional metamorphism

contact metamorphism

burial metamorphism

hydro-thermal metamorphism

cataclysmic metamorphism

What is regional metamorphism?

Regional metamorphism affects the rocks in a large region of the crust, e.g. areas undergoing mountain building (most commonly at convergent boundaries)

tends to produce foliated rocks

metamorphic grade varies depending on P,T

What is contact metamorphism?

Contact metamorphism is the heating of rocks adjacent to igneous intrusions due to heat from magma (not a place to find foliation)

What is burial metamorphism?

Burial metamorphism affects rocks deep in sedimentary basins and is low grade metamorphism due to the deep burial of sediments

results from high lithostatic pressure

Shallow marine setting after millions of years--Fossils can get preserved

Rocks metamorphosed during the Grenville Orogeny about 1.1-1.3 billion years ago are exposed in the Adirondack Mountains of New York and ____.

A) in the Rio Grande valley of Texas
B) in East Texas
C) in the Texas panhandleD) in the Hill Country of Texas

D) in the Hill Country of Texas

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Which of the following is not a foliated metamorphic rock?

A) quartzite
B) phyllite
C) gneiss
D) schist

A) quartzite

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Which of the following statements about metamorphism is NOT correct?

A) Metamorphism requires temperatures between about 200 and 700oC.B) Metamorphism requires that there be a differential pressure in the crust.
C) Metamorphism occurs within Earth's crust.
D) Metamorphism requires pressures greater than atmospheric pressure.

B) Metamorphism requires that there be a differential pressure in the crust.

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Which type of metamorphic rock has relatively smooth breakage surfaces?

Metamorphic grade refers to the general pressure and temperature conditions

What is a mylonite?

A mylonite is a highly strained rock produced as a result of cataclastic metamorphism

How are foliated rocks classified?

Foliated rocks are classified based on type of foliation

How are non-foliated rocks classified?

Non-foliated rocks are classified based on mineral composition

Name a non-foliated rock that refers to rocks with minerals that typically forms from contact metamorhphism

A) hornfels
B) slate
C) schist
D) marble

A) hornfels

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What is the metamorphic facies concept?

Metamorphic facies concept – the mineral composition of a metamorphic rock reflects the rock type of the protolith (the original rock that was metamorphosed) AND metamorphic grade. This concept helps geologists determine things like what the P,T of metamorphism were and what the protolith was. That information can help answer questions like – how deeply were rocks buried (i.e. how tall was an ancient mountain belt), and what type(s) of environment(s) or plate boundaries existed prior to or during metamorphism.